Improvement in grinding-mills



To all whom tt may concern:

A iitni'ttd 'itrt @anni ctmi- ANDREW JQVANDEGRIET' AND GEORGE W. M. VANDEGEIET, o

, i NATI,

L ears Parent No. 103,100, lated May 17, 1870.

IMPROVEMENT IN @BINDING-MILLS.

l, Be-it known that we,ANDr.Ew.J. VANDEGRIET and GEORGE4 W. M. VANDEGRIET, of the cityoi' Oin, cinnati, county of Hamilton and State of f Ohio, have invented new and useful Improvements in Mills'v for `Grinding Coffee,v Spices,` 85o; and we d'o declare.

4the following is a full, clear, and exact description of the same, reference being had to the annexed draw` ings making a part of. this specication, in which- Figure 1 is a front velevation of the devicepas constructed with our improvements.

Figure 2'is a vertical broken section taken in lines z z, iig. 1.

Figure 3 is an elevated view of the device, stand- .irig open, for the purpose hereinafter described.

. Figure is an elevated view of the conical grindi ing-nut.

Figure 5 is a horizontalfbroken section, taken in Figure 6 is a horizontal broken section of the couical grinding-nut, taken in lincs'y y, fig. 4. Similar letters-of reference indicate corresponding parts inthe several figures.

. liZIills/oftliisl class have heretofore been imperfect in not having been `constructed in a manner to render -them susceptible of being conveniently opened yand 'closed, and not haring been provided withza jointed crank, capable of 'being folded up, for convenience in packing, 85o., and ilu not having been provided with a temper-screw, constructed and arranged so that it should be eifectnally prevented from working loose.

' The object of our invention is. to remedy `these de- "fects, and to produce a mill that ca n be readily opened, vin such amanner as to expos'eits internal ports, so

that the' same may be brushed oi or washed, as the' case mayreqnire, after grinding one substance and before grinding another, in order to prevent the mixing i of particles -of the fornier with the latter, and to provide an eilcient mode of preventing the regulating or temper-screw from workingloose by the action of the base of the grinding-nut upon its point, when the mill isdn operation, and also to provide a crank more-suitable to be' applied to coffee-mills and other like implements than has been heretofore in use,and also to provide a mode of vcasting the hopper' and the body of ,the mill together, and, at the same time, to cast the opening for thepassage of'thesubstance from the hop- Vper into the grinding device, without the necessityr of .and B,-i gs. 1, 2, 3, and`5,'A forming the front, and- B forming the back pai-t of the mill, thetwobeing joined together 'by suitable hinges a and b; and to provide a provided a thumb-latch or catch, c, figs. 1, 3, and 5, said latch being fit-ted in a suitable projection on part A, iigs. 1, 3, and 5, and being provided with an oblong head, as shown plainly' in vfigs. 3 and 5, to lit in a suitable slot, l,figs. 3 and 5, provided for the pun pose in part B, figs. 3 and 5, so that, when the mill is closed, the'ohlong head of the latch passes through turn, the head is turned vertically across the slot, and the mill isheld firmly shut, as shown in figs. land 2.

v the construction of the grinding-nut C, gs. 2, 4, and 6, in such va manner that, when the mill-is opened, as shown in figs. 3 and 5, the nut O can be taken out,

the other parts of the mill. 4

To effect this object, we construct the grinding-nut, not as has heretofore been the practice, with a projection on it, to extend through'the front of the mill, for the attachment of the crank, but as a separate casting, in construction independent of said portion; and, in place of that projecting part, for the attachment of a' crank, we have constructed a short shaft, E, figs. 2, 3, and 5.

This short shaft is provded-with a collar, which tits in a suitable recess in the Iinside ofthe concave, or part A of the mill, as shown plainly in figs. 2 and 5, and passing through the front of part A, terminates in a square form, for the attachment of a crank, which is done in the usual way by a nut, h, the collar forming a shoulder. on the inside, and the crank forming a corresponding shonlder on the outside, as shown plainly in figs. 2 and 5. l

`It will beV seen that shaft E is held rmly in its place, independent of the grinding-nut, and to form we have formed a square hole or mortise, f, in grindingnut (l, figs. 2, 4,and 6, and have formed the inner end ing-nut C is placed in its place, .the square end of said nut C, as shown plainly in iig.r2.

'We have also vprovided au improved regulatingscrew, F, figs. 2 and 5, which We "construct with a. square shank.'

` tigs. .2 and 5,w'h,ich, having a square hole in its cen- 5ter, fits ou the square shank of screw F, and 'rests in a recessed seat in the back ofthe mill.

ready means of opening and closing the mill,we have' ,said slot, and the latch being given one quarter One 4of the important improvements in our mill is as shown in figs. 4 and 6, without deranging-any ot' y 'an attachment between shaft E and the grinding-nutof shaft E, igs.2, 3, and 5, square, so that, when grindf shaft ts in the square hole yor mortise in grinding-4 This screw is provided with a friction-washer, S,

' To hold this friction-washer rmly'in its seat, we I have constructed a wire spring, g, figs. 2 and 5, which i `passes through the end of the sllaiikfofscrew F, having its ends curved and properly formed to fit in-i-cavities provided for the purpose infriction-washer S.

This wire spring answers a twofold purpose, forming the spring to press upon the friction-washer, andz at the same time, a convenient means for turning the screw with the fingers.

-1t will be readily understood that the pressure of this spring against the washer, holding it firmly against its seat, is an effective elastic medium for producing friction to prevent the temper-screw from working loose by the action of the base of grinding-nut O against thepoint of said screw, when the mill is in operation.

Our improvement in crank D, figs. 1,2, v3, and 5,

consists in the construction of said` crank with a' hinged joint, i, figs. 1, 2, and 5, to render.it capable of being folded, as shown by dotted ,lines in iig. 1.

The object of this arrangement is to economize space in packing for shipment, 85o., and also thatA the i crank may be folded up out of the Way when not in use.

NVc are aware that folding cranks have been used in tape-line reels, and,perhaps, in some other small instruments, but in such-instances the handle of the crank has folded to the center,and fitted in a chamber or cavity formed for the purpose in the end of'the shaft, upon which the crank was attached. Such a construction is not practical in the majority of cases l The apex of the cone 1s also cut a\vay,to admit of its being attached in two'halves, c and t, figs. 2

and 3, to the respective'parts A and B of the bodyV of the mill, the halft of the hopper forming apart of part B, figs. 1 and 2, ofthe body of the mill, and half' of the hopper forming a part of part A of the body of the mill. In order to admitfof part v of the hopper heing cast with and forming a part of part A of the body of the mill, without the necessity of using a dry sand core in casting feed-opening X, for the passage of the substance to be ground from the hopper-to the grinding device, we have cut away a suiiicient portion "of the ii'ont part of part c of the hopper, iand formedthe sides tapering toward the front, to give the proper draught forl drawing thesand forming the mold, to form the conical front A ofthe body of the mill, while the upper portion Aof the interior of part c of the hopper isformed in the opposite half -of the mold, with the interior of part A of the mill. W'e are thus enabled to cast the two parts A and-vin a green sand mold, the part-ing being made in the sand, as shown by dot-- ted lines'in fig. 2, so that feed-opening X for the substance-to be ground topass through from the hopper to the grinding device is cast in the conical shell of the grinding device, by a4 simple parting, ,as shown.

Then, to complete the construction ot' the hopper, the opening left in its front, for the'purpose described, must be closed. 'lhis we do by the insertion of a plate, a, gs. 1, 2, and 3, of sheet-brass or other suitable metal. This plate is cut in a frm to conform to the shap of the opening, and isinserted by springing it outward in the middle, and inserting the two ends, the plate being sufficiently long to allow the upper end to cat-ch against the inside of the casting, and the lower end, in like manner, inside ofthe casting 'at the bottom the plate then, being allowed to assume its natural position, lays 'close to the casting, and closes the opening neatly, and, at the same time, answers another pur- Ipse, being used as a card-plate, bearing trade-mark,

Our mill, thus constructed, isl operated as follows:

The mill is first secured by being screwed firmly to an upright surface, as shown in figs. 1, 2, 3, and 5. The substance to be ground is` placed in hopper G, and the grinding-nut O, being put in motion by the rotation of crank D, which transmits its motion to grinding-nut C through the medium of short shaft E,

shown plainly in fig. 2, the substance passing from hopper G, through feed-opening X, into the grinding device, is crushed and ground, and passes from the mill through a suitable discharge-opening at the bottom, (see fig. 2.)

To regulate the degree of fineness, the temperscrew F. in the back ofthe mill is turned so as to through j the square hole in said washer, holds the washer firmly against its seat, producing a sufficient amount ot'` friction to prevent the temper-screw from working loose by the action of the base of the grinding-nut i fainstits,point, when in motion. If, after having ground one substance, it is desired that a`nother substance should be ground without .raving' Aparticles of' the former substance mixed with it, it is only necessary to unlatch the mill and open it, as shown in figs. 3 and, and take out the grinding-nut, as shown in figs. 4 and and brush or wash the in.- ternal' parts which thus stand exposed, as the case may require; then replace nut C, and'close the mill and latch it, as shown in figs. 1 and 2, and it is again ready for use.

We have thus 'described our invention as constructed in the form known as a side mill. Our improvements can be equally applied to other forms.

Having thus fully described the' construction and operation of our invention,

' What we claim therein as new, and desire to secure by Letters Patent, is-

1. The combination and arrangement, in a grindingmill,-of the hinged parts A and B and the latch c, as and for the purpose substantially as described.

2l The grinding-nut- C, constructed as described, in combination with revolvingfshaft Eand its operatingcrank, substantiallyy as described.

3. The combination of temper-screw F, spring g,

and washer S, when constructed and arranged to opgrate in the manner substantially as described and set orth.

4. lhe combination and arrangement of the plate n, with part e of the hopper G, as and for the.pur pose set forth and described.

A. J.. VANDEGRIFT.

GEO. W. M. 'VANDEGRIF'L Witnesses:

OAPILLY ADAMs, L WILLIAM R. Mc-Coams. 

